130 lines
4.2 KiB
TypeScript
130 lines
4.2 KiB
TypeScript
import { computePosition, flip, inline, shift } from "@floating-ui/dom"
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import { normalizeRelativeURLs } from "../../util/path"
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import { fetchCanonical } from "./util"
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import { randomIdNonSecure } from "../../util/random"
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const p = new DOMParser()
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async function mouseEnterHandler(
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this: HTMLAnchorElement,
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{ clientX, clientY }: { clientX: number; clientY: number },
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) {
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const link = this
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if (link.dataset.noPopover === "true") {
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return
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}
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async function setPosition(popoverElement: HTMLElement) {
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const { x, y } = await computePosition(link, popoverElement, {
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strategy: "fixed",
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middleware: [inline({ x: clientX, y: clientY }), shift(), flip()],
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})
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Object.assign(popoverElement.style, {
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transform: `translate(${x.toFixed()}px, ${y.toFixed()}px)`,
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})
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}
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function showPopover(popoverElement: HTMLElement) {
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popoverElement.classList.add("active-popover")
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setPosition(popoverElement as HTMLElement)
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if (hash !== "") {
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const targetAnchor = `#popover-internal-${hash.slice(1)}`
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const heading = popoverInner.querySelector(targetAnchor) as HTMLElement | null
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if (heading) {
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// leave ~12px of buffer when scrolling to a heading
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popoverInner.scroll({ top: heading.offsetTop - 12, behavior: "instant" })
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}
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}
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}
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const targetUrl = new URL(link.href)
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const hash = decodeURIComponent(targetUrl.hash)
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targetUrl.hash = ""
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targetUrl.search = ""
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const popoverId = `popover-${link.dataset.slug ?? randomIdNonSecure()}`
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const prevPopoverElement = document.getElementById(popoverId)
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const hasAlreadyBeenFetched = () => !!document.getElementById(popoverId)
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// dont refetch if there's already a popover
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if (hasAlreadyBeenFetched()) {
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showPopover(prevPopoverElement as HTMLElement)
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return
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}
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const response = await fetchCanonical(targetUrl).catch((err) => {
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console.error(err)
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})
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// bailout if another popover exists
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if (hasAlreadyBeenFetched()) {
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return
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}
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if (!response) return
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const [contentType] = response.headers.get("Content-Type")!.split(";")
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const [contentTypeCategory, typeInfo] = contentType.split("/")
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const popoverElement = document.createElement("div")
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popoverElement.id = popoverId
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popoverElement.classList.add("popover")
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const popoverInner = document.createElement("div")
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popoverInner.classList.add("popover-inner")
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popoverInner.dataset.contentType = contentType ?? undefined
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popoverElement.appendChild(popoverInner)
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switch (contentTypeCategory) {
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case "image":
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const img = document.createElement("img")
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img.src = targetUrl.toString()
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img.alt = targetUrl.pathname
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popoverInner.appendChild(img)
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break
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case "application":
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switch (typeInfo) {
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case "pdf":
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const pdf = document.createElement("iframe")
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pdf.src = targetUrl.toString()
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popoverInner.appendChild(pdf)
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break
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default:
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break
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}
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break
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default:
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const contents = await response.text()
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const html = p.parseFromString(contents, "text/html")
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normalizeRelativeURLs(html, targetUrl)
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// prepend all IDs inside popovers to prevent duplicates
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html.querySelectorAll("[id]").forEach((el) => {
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const targetID = `popover-internal-${el.id}`
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el.id = targetID
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})
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const elts = [...html.getElementsByClassName("popover-hint")]
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if (elts.length === 0) return
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elts.forEach((elt) => popoverInner.appendChild(elt))
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}
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document.body.appendChild(popoverElement)
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showPopover(popoverElement)
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}
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function clearActivePopover() {
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const allPopoverElements = document.querySelectorAll(".popover")
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allPopoverElements.forEach((popoverElement) => popoverElement.classList.remove("active-popover"))
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}
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document.addEventListener("nav", () => {
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const links = [...document.getElementsByClassName("internal")] as HTMLAnchorElement[]
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for (const link of links) {
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link.addEventListener("mouseleave", clearActivePopover)
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link.addEventListener("mouseenter", mouseEnterHandler)
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window.addCleanup(() => {
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link.removeEventListener("mouseenter", mouseEnterHandler)
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link.removeEventListener("mouseleave", clearActivePopover)
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})
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}
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})
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